Hi Marnie. My 500 gallon has a blue background, only to be covered by coralline algae completely. The aquarium looks good like that, and it looks good with the blue background as well. I would scrape the coralline once in awhile whenever I feel like it or if anyone say anything about it. Christy, if you're lazy then I'm lazier. Try scraping coralline in a tank that size. Takes about 2 days of scraping, in between I let my back recover. Regards Ken
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